. gold also had a positive day. but i believe the plunge in gold is a very good sign fortheeconomy, justas it was in the '80s and '90s. in other words, some optimism. and senator marco rubio unveils the new immigration reform bill today. here's the key point. when we look at the benefits and score them dynamically, immigration reform will be a huge boost to the economy. "the kudlow report" begins right now. >>> first up tonight, president obama will travel to boston thursday for an interfaith service with bombing victims. more than 24 hours after two bombs ripped through marathon crowds killing three, wounding 170 others, investigators are still no closer to answers. late this afternoon, the fbi said no claims of responsibility have been received, and the search for suspects is wide open. deborah boxdy joins us now from boston with all of the latest. good evening, deborah. >> reporter: good evening, larry. i'm live here along boylston street in the heart of boston, about four blocks or so away from the marathon's finish line, where those two bombs exploded just one day ago. securi